Photovoltaic module

Abstract

The invention relates to a photovoltaic module which comprises a plurality of battery strings, each battery string comprises a plurality of battery pieces connected in series, the size of the battery pieces is small, the current in the battery strings is reduced, and then the power loss in the photovoltaic module is reduced. And bus bars are arranged at two ends of the plurality of battery strings so as to connect the plurality of battery strings. The bus bar comprises a second bus bar and a third bus bar which are arranged at an interval, a second jumper wire is arranged between the second bus bar and the third bus bar, the second jumper wire comprises a first straight section, a second straight section and a fourth bent section, and the fourth bent section is located between the first straight section and the second straight section; the first straight section and the second straight section extend in the second direction.

Description

[0001] This application is a divisional application. The original application has the application number 202411434648.X and the original application date is October 14, 2024. The entire contents of the original application are incorporated herein by reference. Technical Field

[0002] This application relates to the field of photovoltaic power generation technology, and in particular to a photovoltaic module. Background Technology

[0003] Photovoltaic modules convert light energy into electrical energy through the photovoltaic effect of solar cells. Multiple cells are connected in series via busbars, allowing the generated electricity to be collected and discharged. In existing technologies, the cells within a cell string are divided into two segments. As the size of the cells increases, the current within a single cell string becomes larger, resulting in significant power loss in the photovoltaic module. Summary of the Invention

[0004] This application provides a photovoltaic module to address the problem of significant power loss in photovoltaic modules.

[0005] This application provides a photovoltaic module, which includes: Multiple battery strings, each battery string comprising multiple battery cells connected in series, with a busbar at each end of the multiple battery strings; the busbar includes a second busbar and a third busbar, which are spaced apart along a first direction; A jumper wire, which is connected to the busbar and extends in a second direction that intersects the first direction; The jumper includes a second jumper, which is located between the second busbar and the third busbar; The second jumper includes a fourth bend, a first straight section, and a second straight section. The fourth bend is bent along the thickness direction of the photovoltaic module. The first straight section and the second straight section both extend along a second direction. The fourth bend is located between the first straight section and the second straight section.

[0006] In one possible embodiment, the fourth bending portion includes a first bending segment and a second bending segment, both of which extend along the thickness direction of the photovoltaic module and are connected at one end to each other. The other end of the first bending segment is connected to the first straight segment, and the other end of the second bending segment is connected to the second straight segment.

[0007] In one possible embodiment, the second busbar has a second bend at one end near the second jumper, and the third busbar has a third bend at one end near the second jumper, with both the second and third bends bending along the thickness direction of the photovoltaic module.

[0008] In one possible embodiment, the busbar includes a first busbar along the first direction, the first busbar being located on the side of the second busbar away from the third busbar.

[0009] In one possible embodiment, the jumper includes a first jumper that overlaps with the second busbar. A first lead-out is provided on the side of the first jumper away from the second busbar, and a first bend is provided at the end of the first busbar near the second busbar. Both the first lead-out and the first bend extend along the thickness direction of the photovoltaic module.

[0010] In one possible embodiment, the first lead-out member includes a first fixing part and a first lead-out part, the first fixing part and the first lead-out part having an included angle, the first fixing part being connected to the first jumper wire, and the first lead-out part extending along the thickness direction of the photovoltaic module.

[0011] In one possible embodiment, the width of the first fixing part is greater than or equal to the width of the first jumper.

[0012] In one possible embodiment, along the thickness direction of the photovoltaic module, the jumper is located on one side of the solar cell, and along the width direction of the jumper, the spacing between adjacent solar cells is less than the width of the jumper; the photovoltaic module includes an isolator, and along the thickness direction of the photovoltaic module, the isolator is located between the jumper and the solar cell.

[0013] In one possible embodiment, the jumper wire has a width of 4 mm to 8 mm and a thickness of 0.15 mm to 0.4 mm.

[0014] In one possible embodiment, the spacer has a width of 8 mm to 18 mm and a thickness of 0.15 mm to 0.25 mm.

[0015] In one possible embodiment, the photovoltaic module includes a first lead-out hole and a second lead-out hole, the first busbar and the second busbar are led out from the first lead-out hole, the second busbar, the third busbar and the second jumper are led out from the second lead-out hole, and the cross-sectional area of ​​the first lead-out hole is less than or equal to the cross-sectional area of ​​the second lead-out hole.

[0016] This application relates to a photovoltaic module, including multiple cell strings, each containing multiple cells connected in series. The cells are small in size, reducing the current within the cell string and thus lowering power loss in the photovoltaic module. Busbars are provided at both ends of the multiple cell strings to connect them. The busbars include a second busbar and a third busbar spaced apart, with a second jumper between the second and third busbars. The second jumper includes a first straight section, a second straight section, and a fourth bent section, with the fourth bent section located between the first and second straight sections. Both the first and second straight sections extend along a second direction.

[0017] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0018] Figure 1 A circuit diagram of a photovoltaic module provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a photovoltaic module provided in an embodiment of this application; Figure 3 A diagram showing the positional relationship between the battery cells, separators, and jumpers provided in the embodiments of this application; Figure 4 for Figure 2 A magnified view of the area at position I in the middle; Figure 5 A schematic diagram of one embodiment of the first busbar, second busbar, and first jumper provided in this application; Figure 6 A schematic diagram of another embodiment of the first busbar, second busbar, and first jumper provided in this application; Figure 7 A top view of the first busbar, the second busbar, and the first jumper provided in an embodiment of this application; Figure 8 for Figure 2 A magnified view of a portion of location II; Figure 9 Side view of the second busbar, the third busbar, and the second jumper provided in the embodiments of this application; Figure 10 Top view of the second busbar, third busbar, and second jumper provided in the embodiments of this application; Figure 11 This is a schematic diagram of the structure of one embodiment of the second jumper provided in this application. Figure 12 A schematic diagram of another embodiment of the second jumper provided in this application; Figure 13This is a schematic diagram of another embodiment of the second jumper provided in this application.

[0019] Figure label: 1- Battery string; 11-Battery Cell; 2-Busbar; 21-First busbar; 211 - First bend; 22-Second busbar; 221 - Second bend; 222 - Fifth bend; 23-Third busbar; 231 - Third bend; 24-Edge busbar; 3-Jumper wire; 31 - First jumper; 32 - Second jumper; 321 - Fourth bend; 321a - First bend segment; 321b - Second bend; 322 - First straight section; 323 - Second straight section; 324 - First Main Body; 325 - Second Main Body; 325a - Third straight section; 325b - Third bend section; 4-First lead-out component; 41-First fixing part; 42-First Lead-Out Section; 5-Isolation components; 6-First lead-out hole; 7-Second lead-out hole; 8-Second lead-out element; 81-Second fixing part; 82-Second introduction.

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0021] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0022] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0023] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0024] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0025] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0026] like Figure 1 and Figure 2 As shown in the figure, this application embodiment provides a photovoltaic module, which includes multiple battery strings 1. Busbars 2 are provided at both ends of each battery string 1 to connect the multiple battery strings 1. Along the thickness direction Z of the photovoltaic module, photovoltaic glass is provided on the front side of each battery string 1, and an adhesive film layer is provided between the photovoltaic glass and the battery string 1. A backsheet or photovoltaic glass is provided on the back side of each battery string 1, and an adhesive film layer is also provided between the battery string 1 and the backsheet or photovoltaic glass. After lamination, a laminate is formed. A frame is provided circumferentially along the laminate to protect the edges of the laminate, thus forming the photovoltaic module.

[0027] The battery string 1 includes multiple battery cells 11 connected in series. This application does not limit the structure of the battery cells 11. The types of battery cells 11 include, but are not limited to, passivated emitter rear cell (PERC), tunnel oxide passivated contact (TOPCon), intrinsic thin-film heterojunction (HJT), interdigitated back contact (IBC), perovskite cell, multi-busbar cell (MBB), and busbarless cell (OBB).

[0028] For PERC cells, along their thickness direction, the PERC cell sequentially includes a front-surface silver electrode, a front-surface silicon nitride passivation layer, a phosphorus emitter layer, a P-type substrate silicon layer, a localized aluminum back field, a metallic aluminum back electrode, and a back passivation layer (Al2O3 / SiNx). PERC cells use a passivation film to passivate the back side, replacing the all-aluminum back field, enhancing light reflection within the silicon substrate, reducing the recombination rate on the back side, and improving the cell efficiency by 0.5%-1%.

[0029] For TOPCon cells, along their thickness direction, the TOPCon cell sequentially includes a silver electrode, a front-surface silicon nitride passivation layer, a boron-doped emitter, an N-type substrate silicon layer, a diffused doped layer, an ultrathin silicon oxide layer, doped polycrystalline silicon, silicon nitride, and the silver electrode. The back of the cell consists of an ultrathin silicon oxide layer (1nm~2nm) and a phosphorus-doped microcrystalline amorphous mixed Si film, which together form a passivation contact structure. This structure can block minority carrier recombination, increasing the cell's open-circuit voltage and short-circuit current. The ultrathin oxide layer allows majority carrier electrons to tunnel into the polycrystalline silicon layer while blocking minority carrier recombination. The excellent passivation effect of the ultrathin silicon oxide and heavily doped silicon film causes band bending on the silicon wafer surface, resulting in a field passivation effect. This significantly increases the probability of electron tunneling, reduces contact resistance, and improves the cell's open-circuit voltage and short-circuit current, thereby increasing the cell's conversion efficiency.

[0030] For an HJT cell, along its thickness direction, the HJT cell sequentially includes a front low-temperature silver electrode, a front conductive film, an N-type amorphous silicon film, an intrinsic amorphous silicon film, an N-type substrate silicon layer, an intrinsic amorphous silicon film, a P-type amorphous silicon film, a back conductive film, and a back low-temperature silver electrode.

[0031] For an IBC cell, along its thickness direction, it sequentially includes a silicon nitride anti-reflection layer, an N+ front surface field, an N-type substrate silicon layer, a P+ emitter, an N+ back field, an aluminum oxide passivation layer, a silicon nitride anti-reflection layer, and a silver electrode. IBC cells utilize ion implantation technology to obtain P- and N-regions with good uniformity and precisely controllable junction depth. The absence of grid lines on the front side eliminates light-blocking current loss from the metal electrodes, maximizing the utilization of incident photons and improving short-circuit current by approximately 7% compared to conventional solar cells. Due to its back-contact structure, grid line shading is not a concern, allowing for a wider grid line ratio, thus reducing series resistance and achieving a high fill factor. Optimized design of surface passivation and light-trapping structures can be achieved, resulting in lower front-surface recombination rates and surface reflection.

[0032] For a perovskite solar cell, along its thickness direction, it sequentially comprises a substrate material, a conductive thin film, an electron transport layer (titanium dioxide), a perovskite absorption layer (hole transport layer), and a metal cathode. Perovskite materials possess a high light absorption coefficient and a long carrier diffusion distance. After the photons absorbed by the perovskite material are converted into electrons, they are easily collected by the electrodes with minimal loss, thus generating high photogenerated voltage and current, resulting in high photoelectric conversion efficiency.

[0033] For multi-busbar solar cells, multiple busbars are arranged on the cell surface to collect current, shortening the current conduction path and reducing internal losses, thereby increasing the power output of the multi-busbar solar cell. As the number of busbars increases, the cross-sectional area of ​​the busbars and solder ribbons decreases, and the encapsulant layer becomes thinner, which can reduce the production cost of photovoltaic modules. With an increase in the number of busbars, the number of fine grids can be reduced accordingly, further reducing the production cost of the solar cell.

[0034] For gridless solar cells, there are no main grids on the cell surface. After multiple cells are welded together, solder ribbons replace the original main grids and directly connect to the fine grids, reducing silver paste consumption and lowering cell production costs. Gridless solar cells reduce the light-shielding area of ​​the grid lines within the cell and decrease fine grid transmission losses, thereby increasing the overall module power. Simultaneously, the increased number of fine grid contact points reduces the risk of microcracks in the thin silicon wafer, improving yield and reliability.

[0035] Multiple solar cells 11 in the solar string 1 can be welded using a lap welding technique. Adjacent solar cells 11 overlap, with an overlap area of ​​0.2mm to 0.6mm. Solder ribbons are then placed in the overlap area to connect the adjacent solar cells 11 in series, forming the solar string 1. This lap welding method reduces the spacing between the solar cells 11, increasing the area of ​​each solar cell 11 within the photovoltaic module and thus increasing the effective light-absorbing area, thereby improving the power generation of the photovoltaic module. However, the overlapping arrangement of adjacent solar cells 11 and the presence of solder ribbons in the overlap area can lead to stress concentration during lamination. A buffer layer can also be placed in the overlap area to reduce the possibility of microcracks in the solar cells 11 during lamination.

[0036] The solar cell 11 can be a two-piece, three-piece, or four-piece solar cell. Taking a four-piece solar cell as an example, a complete solar cell is divided into four equal parts to form a four-piece solar cell. Depending on the size of the complete solar cell, the length of the four-piece solar cell can be 182.3 mm, and the width can be from 46.675 mm to 53.25 mm. After multiple four-piece solar cells in the solar cell string 1 are stacked and welded, the overlap area between adjacent four-piece solar cells can be 0.2 mm to 0.6 mm, and the spacing between adjacent solar cell strings 1 can be 1.2 mm to 1.6 mm. This allows the length of the photovoltaic module to be from 2278 mm to 2382 mm, and the width to be 1134 mm. The current of a four-piece solar cell is 1 / 4 of the current of a bent solar cell. Therefore, the current of a single solar cell string 1 is also 1 / 4 of the current of a complete solar cell, which can reduce the power loss of a single solar cell string 1 and improve the power of the photovoltaic module. A photovoltaic module consists of a battery string 1 composed of multiple quarter-cell solar cells connected in series. Four battery strings 1 are connected in parallel to form a battery string group through a bus bar 2. Multiple battery string groups are then connected in series so that the output current of the photovoltaic module is the same as the output current of the battery string 1 composed of bent solar cells connected in series.

[0037] like Figure 1 and Figure 2 As shown, the busbar 2 includes a first busbar 21, a second busbar 22, and a third busbar 23 to connect multiple battery strings 1. Along the first direction X, the first busbar 21, the second busbar 22, and the third busbar 23 are spaced apart. The opposite end of the first busbar 21 and the second busbar 22 is a first lead-out end, and a first junction box is provided at the first lead-out end. The first busbar 21 and the second busbar 22 are connected to the first junction box. The opposite end of the second busbar 22 and the third busbar 23 is a second lead-out end, and a second junction box is provided at the second lead-out end. The second busbar 22 and the third busbar 23 are connected to the second junction box. The first junction box and the second junction box are connected to external devices.

[0038] like Figure 1 , Figure 2 and Figure 3 As shown, the photovoltaic module also includes a jumper 3, which is connected to the busbar 2 and extends along a second direction Y. The second direction Y intersects the first direction X. Optionally, the second direction Y and the first direction X are perpendicular to each other, allowing the jumper 3 to connect multiple busbars 2. In one possible embodiment, along the width direction X of the jumper 3, the spacing between adjacent solar cells 11 is less than the width of the jumper 3. Along the thickness direction Z of the photovoltaic module, the jumper 3 is located on one side of the solar cell 11. Along the thickness direction Z of the photovoltaic module, a spacer 5 is provided between the jumper 3 and the solar cell 11 to separate the solar cell 11 from the jumper 3.

[0039] The isolator 5 is made of insulating material and the jumper 3 is a conductive metal strip. The isolator 5 is placed between the jumper 3 and the solar cell 11, which can reduce the possibility of short circuit caused by contact between the jumper 3 and the solar cell, thereby improving the safety of the photovoltaic module.

[0040] In one possible embodiment, the jumper 3 has a width of 4 mm to 8 mm and a thickness of 0.15 mm to 0.4 mm.

[0041] If the width of jumper 3 is less than 4mm and the thickness is less than 0.15mm, the cross-sectional area of ​​jumper 3 is small, resulting in poor current carrying capacity and inability to carry the current in the photovoltaic module. If the width of jumper 3 is greater than 8mm, the size of the overlapping area between jumper 3 and cell 11 increases. During the lamination process, the risk of microcracks in cell 11 caused by jumper 3 increases. If the photovoltaic module is a double-glass module, both sides of cell 11 are used to absorb sunlight. An excessively wide jumper 3 will increase the shading of cell 11, thus affecting power generation efficiency. Therefore, the width of jumper 3 can be 4mm, 6mm, 8mm, etc. Along the width direction X of jumper 3, the spacing between adjacent cells 11 is 1.6mm, which is less than the width of jumper 3. Therefore, jumper 3 is set on one side of the thickness direction Z of cell 11. If the thickness of jumper 3 is greater than 0.4mm, the jumper 3 will protrude a large size from the battery cell 11. During the lamination process, this will increase the possibility of the jumper 3 squeezing the battery cell 11, causing microcracks in the battery cell 11. It will also increase the possibility of the jumper 3 deforming, causing the jumper 3 to come into contact with the battery cell 11 and cause a short circuit. Therefore, the thickness of jumper 3 can be 0.15mm, 0.3mm, 0.4mm, etc.

[0042] In one possible embodiment, the spacer 5 has a width of 8 mm to 18 mm and a thickness of 0.15 mm to 0.25 mm.

[0043] The spacer 5 is used to separate the jumper wire 3 from the solar cell 11. The jumper wire 3 is centered on the spacer 5 to reduce the possibility of short circuits caused by contact. Therefore, the width of the spacer 5 needs to be greater than the width of the jumper wire 3. If the width of the spacer 5 is less than 8mm, it will increase the possibility of short circuits caused by contact between the jumper wire 3 and the solar cell 11. If the width of the spacer 5 is greater than 18mm, the area of ​​the overlap between the spacer 5 and the solar cell 11 will also increase, resulting in an increased impact of the spacer 5 on the solar cell 11 during the lamination process. In double-glass modules, this has a significant impact on power generation efficiency. Therefore, the width of the spacer 5 can be 8mm, 13mm, 18mm, etc. The insulating component 5 is located between the jumper wire 3 and the battery cell 11. If the thickness of the insulating component 5 is greater than 0.25mm, the thickness of both the jumper wire 3 and the insulating component 5 will be too large. During the lamination process, the stress at the jumper wire 3 position will be large, which may easily lead to microcracks in the battery cell 11. The insulating component 5 plays an insulating role between the jumper wire 3 and the battery cell 11. The insulation performance of the insulating component 5 decreases as the thickness of the insulating component 5 decreases. If the thickness of the insulating component 5 is less than 0.15mm, the insulation performance of the insulating component 5 is poor, and the possibility of a short circuit between the jumper wire 3 and the battery cell 11 is greater. Therefore, the thickness of the insulating component can be 0.15mm, 0.2mm, 0.25mm, etc.

[0044] like Figure 2 , Figure 4 and Figure 5 As shown, the jumper 3 includes a first jumper 31, which overlaps with the second busbar 22. A first lead-out member 4 is provided on the side of the first jumper 31 away from the second busbar 22. A first bend 211 is provided at the end of the first busbar 21 near the second busbar 22. Both the first lead-out member 4 and the first bend 211 extend along the thickness direction Z of the photovoltaic module to form the first lead-out end.

[0045] During the assembly of the photovoltaic module, the jumper wire 3 is first bonded to the separator 5, and then laid on the solar cell 11. A notch is provided in the separator 5 at the intersection of the first jumper wire 31 and the second busbar 22 to avoid the second busbar 22, ensuring a distance of 1mm to 2mm between the edge of the second busbar 22 and the separator 5, facilitating welding between the first jumper wire 31 and the second busbar 22. In this embodiment, the photovoltaic module may include three sets of cell strings, each set including four cell strings 1 arranged in a matrix. Each cell string 1 includes multiple four-cell cells connected in series. Along the second direction Y, edge busbars 24 are provided on both sides of each set of cell strings. The first busbar 21 is located in the middle of the first set of cell strings, and the first busbar 21 and the edge busbar 24 connect the four cell strings 1 in parallel to form the first cell string group. The second busbar 22 is located in the middle of the second set of cell strings, and the second busbar 22 and the edge busbar 24 connect the four cell strings 1 in parallel to form the first cell string group. Battery strings 1 are connected in parallel to form a second battery string group. The third bus bar 23 is located in the middle of the third battery string group. The third bus bar 23 and the edge bus bar 24 connect the four battery strings 1 in parallel to form a third battery string group. The edge bus bar 24 of the second battery string group is connected to the edge bus bar 24 of the third battery string group, so that the second battery string group and the third battery string group are connected in series. The two ends of the first jumper 31 are respectively connected to the two edge bus bars 24 of the first battery string group. The first jumper 31 and the second bus bar 22 overlap to connect the first battery string group and the second battery string group in series.

[0046] Busbar 2, jumper 3, and lead wire are all conductive metal strips. The first lead 4 is connected to the first busbar 21 and can lead out the current in the first busbar 21. A diode is installed in the first junction box. The first lead 4 and the first bend 211 are respectively connected to the two ends of the diode. When the second or third battery string fails, the diode can make the current skip over the faulty battery string, thus protecting the circuit. The first lead 4 and the first bend 211 are spaced apart. The first lead 4 is located on the side of the first jumper 31 away from the second busbar 22, so that the position of the first lead 4 can be adjusted along the extension direction X of the second busbar 22 away from the first bend 211, so that the first lead 4 only needs to contact the first jumper 31. This increases the gap between the first lead 4 and the first bend 211, reducing the possibility of accidental contact between the first lead 4 and the first bend 211 and causing a short circuit, thus improving the safety of the photovoltaic module.

[0047] like Figure 5 As shown, in one possible embodiment, the first lead-out member 4 includes a first fixing part 41 and a first lead-out part 42. The first fixing part 41 is connected to the first jumper 31, and the first lead-out part 42 has an included angle with the first fixing part 41, so that the first lead-out part 42 extends along the thickness direction Z of the photovoltaic module.

[0048] The first jumper 31 is welded to the second busbar 22, and the first fixing part 41 is welded to the first jumper 31. The lead wire and the first fixing part 41 have an angle, so that the first lead part 42 of the first lead 4 can be connected to the first junction box and is approximately parallel to the first bend 211 of the first busbar 21. This reduces the possibility of accidental contact between the first lead part 42 and the first bend 211, thereby improving the safety of the photovoltaic module.

[0049] like Figure 5 As shown, in one possible embodiment, the width of the first fixing part 41 is greater than or equal to the width of the first jumper 31.

[0050] The first fixing part 41 is welded to the first jumper 31. Increasing the width of the first fixing part 41 improves the reliability of the weld between the first fixing part 41 and the first jumper 31. If the end of the first fixing part 41 protrudes from the first jumper 31 and the thickness of the jumper 31 is small, the protruding part of the first fixing part 41 can be bent towards the second busbar 22, so that the protruding part of the first fixing part 41 is welded to the second busbar 22, which can further improve the reliability of the lead-out component after welding.

[0051] like Figure 6 and Figure 7 As shown, in one possible embodiment, the second busbar 22 is provided with a fifth bend 222 on the side near the first busbar 21. The fifth bend 222 extends along the thickness direction Z of the photovoltaic module and is parallel to the first bend 211.

[0052] The first jumper 31 is located at the position where the fifth bend 222 is provided on the second busbar 22, and is welded to the second busbar 22 so that the current in the jumper 3 can be led out through the fifth bend 222. The bend of the second busbar 22 to form the fifth bend 222 reduces the number of welding operations at the first lead-out end, thereby reducing the risk of solder joint failure and improving the reliability of the photovoltaic module.

[0053] like Figure 1 and Figure 2 As shown, in one possible embodiment, the jumper 3 further includes a second jumper 32, which is located between the second busbar 22 and the third busbar 23. The two ends of the second jumper 32 are respectively connected to the two edge busbars 24 of the second battery string and the two edge busbars 24 of the third battery string.

[0054] The second junction box contains two diodes. One end of the second busbar 22 near the third busbar 23 is connected to one end of one diode. One side of the second jumper 32 is connected to the other end of one diode, and the other side of the second jumper 32 is connected to one end of another diode. The third busbar 23 is connected to the other end of the third diode. When a cell 11 in the second or third battery string fails, the diodes in the second junction box and the second jumper 32 conduct, bypassing the faulty battery string and thus protecting the circuit.

[0055] like Figure 8 , Figure 9 and Figure 10 As shown, in one possible embodiment, the second busbar 22 has a second bend 221 at one end near the second jumper 32, and the third busbar 23 has a third bend 231 at one end near the second jumper 32. The second jumper 32 includes a fourth bend 321, which is located between the second bend 221 and the third bend 231. The second bend 221, the third bend 231, and the fourth bend 321 are all bent along the thickness direction Z of the photovoltaic module to form a second lead-out end. The second jumper 32 does not need to be connected to the second busbar 22 or the third busbar 23. Therefore, the separator 5 located between the second jumper 32 and the cell 11 is a continuous insulating strip, eliminating the need for a clearance structure at the second busbar 22 or the third busbar 23. This facilitates the installation of the separator 5 and improves the assembly efficiency of the photovoltaic module.

[0056] The second bend 221, the third bend 231, and the fourth bend 321 all extend along the thickness direction Z of the photovoltaic module, causing the second lead to protrude from the photovoltaic module for easy connection to the second junction box. Since the second bend 221, the third bend 231, and the fourth bend 321 all extend in the same direction, they can be approximately parallel, reducing the possibility of accidental short circuits caused by accidental contact of the second bend 221, the third bend 231, and the fourth bend 321.

[0057] like Figure 11As shown, in one possible embodiment, the second jumper 32 includes a first straight segment 322 and a second straight segment 323, with a fourth bend 321 located between the first straight segment 322 and the second straight segment 323. Both the first straight segment 322 and the second straight segment 323 extend along the second direction Y, and the ends of the first straight segment 322 and the second straight segment 323 away from the fourth bend 321 are connected to the edge busbar 24. The fourth bend 321 includes a first bend segment 321a and a second bend segment 321b, both extending along the thickness direction Z of the photovoltaic module. One end of the first bend segment 321a is connected to one end of the second bend segment 321b, the other end of the first bend segment 321a is connected to the first straight segment 322, and the other end of the second bend segment 321b is connected to the second straight segment 323, making the second jumper 32 a "U"-shaped structure.

[0058] In the fourth bend 321, there may be a gap between the sidewalls of the first bend segment 321a and the second bend segment 321b, or they may fit together, so that the fourth bend 321 can extend along the thickness direction Z of the photovoltaic module. The first straight segment 322, the second straight segment 323, and the fourth bend 321 are bent into shape by the second jumper 32, which reduces the possibility of the fourth bend 321 falling off and improves the reliability of the second lead-out terminal after connecting to the second junction box.

[0059] like Figure 12 As shown, in one possible embodiment, the second jumper 32 includes a first main body 324 and a second main body 325. The first main body 324 extends along a second direction Y, and the second main body 325 includes a third straight section 325a and a third bent section 325b. The third straight section 325a extends along the second direction Y, and the third bent section 325b extends along the thickness direction Z of the photovoltaic module, making the second main body 325 have an L-shaped structure. One end of the second main body 325 in which the third bent section 325b is disposed is welded to the first main body 324, and the ends of the first main body 324 and the second main body 325 that are far apart from each other are respectively connected to the edge busbar 24.

[0060] The first main body 324 is welded to the second main body 325, connecting them. Current in the first main body 324 can be transmitted to the second junction box through the third bend 325b in the second main body 325. The second main body 325 has an L-shaped structure, reducing the number of bends and simplifying its manufacturing process. The position of the second main body 325 can be determined based on the positions of the second busbar 22 and the third busbar 23, ensuring that the three leads of the second lead are aligned in a straight line, facilitating connection between the second lead and the second junction box.

[0061] like Figure 13As shown, in one possible embodiment, a second lead-out member 8 is provided on the second jumper 32. The second lead-out member 8 includes a second fixing part 81 and a second lead-out part 82. The second fixing part 81 extends along the second direction Y and is welded and fixed to the second jumper 32. The second lead-out part 82 extends along the thickness direction Z of the photovoltaic module.

[0062] The second lead 8 is soldered to the second jumper 32, allowing the current in the second jumper 32 to be conducted to the second junction box through the second lead 8. The position of the second lead 8 in the second jumper 32 can be determined according to the positions of the second busbar 22 and the third busbar 23, so that the three leads of the second lead end are in the same straight line, which facilitates the connection between the second lead end and the second junction box.

[0063] like Figure 4 and Figure 8 As shown, the photovoltaic module includes a first lead-out hole 6 and a second lead-out hole 7. The cross-sectional area of ​​the first lead-out hole 6 is less than or equal to the cross-sectional area of ​​the second lead-out hole 7. The first lead-out end is led out from the first lead-out hole 6 and connected to the first junction box, and the second lead-out end is led out from the second lead-out hole 7 and connected to the second junction box.

[0064] Along the second direction Y, the first busbar 21, the second busbar 22, the third busbar 23, the first lead-out hole 6, and the second lead-out hole 7 are all located between adjacent battery strings 1. The distance between the busbar and the battery string 1 is 3mm, and the distance between the first lead-out hole 6 and the second lead-out hole 7 and the battery string 1 is 1mm to 2mm. This reduces the possibility of moisture in the environment entering the photovoltaic module through the first lead-out hole 6 or the second lead-out hole 7 and coming into contact with the battery cell 11, causing a short circuit. It also allows the busbar to be led out through the first lead-out hole 6 or the second lead-out hole 7. The first lead-out end includes two lead wires, one of which is the first bend 211 of the first busbar 21, and the other is the fifth bend 222 of the second busbar 22 or the first lead-out part 42 of the first lead-out member 4. The second lead-out end includes three leads: one is the second bend 221 of the second busbar 22, another is the third bend 231 of the third busbar 23, and the third is one of the fourth bend 321, the third bend 325b, or the second lead-out portion 82 in the second jumper 32. The first lead-out hole 6 and the second lead-out hole 7 can be oblong holes or through holes with rectangular, elliptical, or other cross-sectional shapes. In order to maintain the distance between the first lead-out hole 6 and the second lead-out hole 7 and the battery cell 11, the dimensions of the first lead-out hole 6 and the second lead-out hole 7 are fixed along the second direction Y, and the cross-sectional area of ​​the first lead-out hole 6 is less than or equal to the cross-sectional area of ​​the second lead-out hole 7. Along the first direction X, the size of the first lead-out hole 6 can be reduced so that the leads at the first end are all within the range of the first lead-out hole 6. Along the first direction X, the second lead hole 7 is larger in size, which can increase the spacing between the multiple leads of the second lead end, thereby reducing the possibility of short circuit caused by accidental contact of the multiple leads of the second lead end.

[0065] This application relates to a photovoltaic module, including multiple cell strings 1, each cell string 1 comprising multiple solar cells 11 connected in series. Busbars 2 are provided at both ends of each cell string 1 to connect the multiple cell strings 1. Each busbar 2 includes a first busbar 21, a second busbar 22, and a third busbar 23, spaced apart along a first direction X. The end of the first busbar 21 opposite to the second busbar 22 is a first lead-out terminal, and the end of the second busbar 22 opposite to the third busbar 23 is a second lead-out terminal. The photovoltaic module also includes a first jumper wire 31, which overlaps with the second busbar 22. The first busbar 21 has a first bend 211 at one end near the second busbar 22, and the first jumper 31 has a first lead-out 4 on the side away from the second busbar 22. This facilitates adjusting the distance between the first lead-out 4 and the first bend 211, thereby reducing the possibility of accidental contact between the first lead-out 4 and the first bend 211 and causing a short circuit, thus improving the safety of the photovoltaic module.

[0066] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A photovoltaic module, characterized in that, The photovoltaic module includes: Multiple battery strings, each battery string comprising multiple battery cells connected in series, with a busbar at each end of the multiple battery strings; the busbar includes a second busbar and a third busbar, which are spaced apart along a first direction; A jumper wire, which is connected to the busbar and extends in a second direction that intersects the first direction; The jumper includes a second jumper, which is located between the second busbar and the third busbar; The second jumper includes a fourth bend, a first straight section, and a second straight section. The fourth bend is bent along the thickness direction of the photovoltaic module. The first straight section and the second straight section both extend along a second direction. The fourth bend is located between the first straight section and the second straight section.

2. The photovoltaic module according to claim 1, characterized in that, The fourth bending portion includes a first bending segment and a second bending segment. Both the first bending segment and the second bending segment extend along the thickness direction of the photovoltaic module, and one end of each segment is connected to the other. The other end of the first bending segment is connected to the first straight segment, and the other end of the second bending segment is connected to the second straight segment.

3. The photovoltaic module according to claim 1, characterized in that, The second busbar has a second bend at one end near the second jumper, and the third busbar has a third bend at one end near the second jumper. Both the second bend and the third bend are bent along the thickness direction of the photovoltaic module.

4. The photovoltaic module according to claim 1, characterized in that, The busbar includes a first busbar, which is located on the side of the second busbar away from the third busbar along the first direction.

5. The photovoltaic module according to claim 4, characterized in that, The jumper includes a first jumper that overlaps with the second busbar. A first lead-out is provided on the side of the first jumper away from the second busbar. A first bend is provided at the end of the first busbar near the second busbar. Both the first lead-out and the first bend extend along the thickness direction of the photovoltaic module.

6. The photovoltaic module according to claim 5, characterized in that, The first lead-out member includes a first fixing part and a first lead-out part, with an included angle between the first fixing part and the first lead-out part, the first fixing part being connected to the first jumper wire, and the first lead-out part extending along the thickness direction of the photovoltaic module.

7. The photovoltaic module according to claim 6, characterized in that, The width of the first fixing part is greater than or equal to the width of the first jumper.

8. The photovoltaic module according to claim 1, characterized in that, Along the thickness direction of the photovoltaic module, the jumper is located on one side of the solar cell, and along the width direction of the jumper, the spacing between adjacent solar cells is less than the width of the jumper; the photovoltaic module includes an isolator, and along the thickness direction of the photovoltaic module, the isolator is located between the jumper and the solar cell.

9. The photovoltaic module according to claim 8, characterized in that, The jumper wire has a width of 4mm to 8mm and a thickness of 0.15mm to 0.4mm.

10. The photovoltaic module according to claim 8, characterized in that, The width of the spacer is 8mm to 18mm and the thickness is 0.15mm to 0.25mm.

11. The photovoltaic module according to claim 4, characterized in that, The photovoltaic module includes a first lead-out hole and a second lead-out hole. The first busbar and the second busbar are led out from the first lead-out hole, and the second busbar, the third busbar and the second jumper are led out from the second lead-out hole. The cross-sectional area of ​​the first lead-out hole is less than or equal to the cross-sectional area of ​​the second lead-out hole.

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